I wrote previously on Fort Supply. The Ft. Supply to El Reno military and freight road was laid down in 1869 as part of the military supply line connecting three states. The trail crosses present-day Rt. 50 just south of Mooreland, OK. It was common for new roads to closely follow the original trails, so just a bit further south, you can see where the trail crossed the North Canadian River right alongside the existing highway bridge. You can see several of the pilings from the original bridge that would have borne mule wagons and stagecoaches across the plain. There are three near the left bank, four visible on the island, and those near the right bank are buried in foliage.
As for the weather during the upcoming Missouri River trip, the heat is supposed to increase a degree every day, to reach 109 by Tuesday. Come on fan!